Enhancing the Osseointegration of Titanium Implants by Modulating M1/M2 Macrophage Polarization through PI3K-Akt...

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Implantology

Background:

• Osseointegration of titanium implants is vital for therapeutic success.
• Mechanisms underlying surface modification-enhanced osseointegration require further elucidation.

Purpose of the Study:

• To systematically investigate the mechanisms by which "cortex-like" microarc oxidation (MAO) coatings enhance osseointegration.
• To reveal the synergistic regulation of immune response, angiogenesis, and osteogenesis by MAO-coated titanium implants.

Main Methods:

• Material characterization of MAO coatings.
• In vitro and in vivo experiments assessing macrophage polarization, angiogenesis, and osteogenesis.
• Bioinformatics analysis including transcriptomics and immunohistochemistry.

Main Results:

• "Cortex-like" MAO coatings possess favorable physicochemical properties (hybrid micronano-morphology, superhydrophilicity).
• MAO coatings induce an anti-inflammatory M2 macrophage phenotype in vitro, promoting osteogenesis.
• In vivo, MAO coatings modulate macrophage polarization, enhance angiogenesis, and increase osseointegration.
• Transcriptomic analysis identified the PI3K-Akt signaling pathway as crucial for MAO-mediated osseointegration.

Conclusions:

• "Cortex-like" MAO coatings enhance titanium implant osseointegration by synergistically regulating immune, vascular, and bone-forming cells.
• Macrophage polarization via the PI3K-Akt pathway is a key mechanism underlying MAO coating efficacy.
• MAO coatings represent a promising strategy for advancing titanium implant technology and improving patient outcomes.